I was just wondering - when carrying stuff, how heavy is to heavy?

I gather it depends on your overall fitness and strength, and what you are used to.

But, if i carry something that is considered to heavy for me, what is the worst case senairo. At my stage of preg - i assume early labour - and being 36 1/2 weeks or so, am not to bothered by that. (not saying i trying to bring it on or anything).

I assume early on in pregnancy, can lead to more serious issues, but, i just carried something, that weighed about similar to a 30can pack of coke. Should be ok?